{"id":"CVE-2026-98173","aliases":[],"cve":{"records":[{"id":"CVE-2026-98173","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.322Z","published":"2026-10-06T08:44:17.567Z","modified":"2026-10-30T12:37:52.156Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:37:52.156Z"}],"references":[{"url":"https://git.kernel.org/stable/c/93e8a49adb2a575202c5ee766435eff2f9f95f5b","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/ee0d8f83d68f6e6509f092c997ccab3c8c801538","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/c941f1ebfd26f683de81091473f3596a218abff0","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/e99040e5e9c60441e6b4725e1a7b88c3106ae903","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/ec36b38e65596950e6c29bed7dfc90b98707c19c","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/d034e836eefd7ce75e588f7031cffbeec594f5ac","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"smb: client: fix use-after-free of iface in cifs_try_adding_channels()","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free of iface in cifs_try_adding_channels()\n\ncifs_try_adding_channels() iterates ses->iface_list with\nlist_for_each_entry_safe_from(), which captures the next entry\n(niface) under iface_lock.  The loop body then drops iface_lock for\nthe whole duration of cifs_ses_add_channel().\n\nA concurrent interface refresh (SMB3_request_interfaces() ->\nparse_server_interfaces()) marks all ifaces inactive and removes and\nfrees any that are not re-advertised via list_del() + kref_put(),\nwhere release_iface() is a bare kfree().  Since niface typically has\nno channel holding a reference, the list reference is its last and it\ncan be freed inside the unlocked window.  On continue, the iterator\nadvance step then dereferences niface->iface_head.next, and the loop\nbody reads iface->rdma_capable/is_active, both on freed memory.\n\nFix this by never keeping an unreferenced list pointer across the\nunlocked window.  Each channel attempt now re-scans the list from the\nhead under iface_lock, takes a kref on the selected candidate, and\npasses only that referenced candidate to cifs_ses_add_channel().\nweight_fulfilled still tracks selection progress, so restarting the\nscan preserves the original weighted distribution and the\nweight_fulfilled-before-kref_put ordering on the failure path.\n\nAdd a per-pass attempts cap so a flapping interface refresh cannot\nkeep the inner loop spinning within a single tries increment.","score":7.5,"severity":"high","published":"2026-10-06T08:44:17.567Z","modified":"2026-10-30T12:37:52.156Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"93e8a49adb2a575202c5ee766435eff2f9f95f5b","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"ee0d8f83d68f6e6509f092c997ccab3c8c801538","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"c941f1ebfd26f683de81091473f3596a218abff0","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"e99040e5e9c60441e6b4725e1a7b88c3106ae903","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"ec36b38e65596950e6c29bed7dfc90b98707c19c","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"d034e836eefd7ce75e588f7031cffbeec594f5ac","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98173"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98173"}],"remediation":[],"references":["https://git.kernel.org/stable/c/93e8a49adb2a575202c5ee766435eff2f9f95f5b","https://git.kernel.org/stable/c/ee0d8f83d68f6e6509f092c997ccab3c8c801538","https://git.kernel.org/stable/c/c941f1ebfd26f683de81091473f3596a218abff0","https://git.kernel.org/stable/c/e99040e5e9c60441e6b4725e1a7b88c3106ae903","https://git.kernel.org/stable/c/ec36b38e65596950e6c29bed7dfc90b98707c19c","https://git.kernel.org/stable/c/d034e836eefd7ce75e588f7031cffbeec594f5ac"],"sources":[{"name":"CVE","id":"CVE-2026-98173","modified":"2026-10-30T12:37:52.156Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-98173"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.5}],"sourceAffected":[],"observedAt":"2026-10-30T14:00:57.385Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:10:30.655Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}